I guess, since VIS is THE most important stage (Where the compiler works out which polys are viewable and which are not*), without it, I'm not sure the lighting stage has anything to work from.
(Also - VIS can take a hella long time - I think on my map VIS and Lighting take something like 16-20 hours to complete properly!!!!)

*Simplified version of what it does - someone will no doubt correct me

NOTE: Once you've VISed you can just run a lighting pass without having to revis the map (As long as you haven't changed anything within the map)

It would only work for the areas that are visible by the sky, so the inside of the Star Destroyer still has to be lit manually, but it really makes outdoor lighting a lot easier. Plus, you could get good, fluid, ambient lighting all around the Star Destroyer.

I don't know if that's what you meant when you asked for lighting help. (I know monsoontide has been giving tips about the compiling half.)